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CVE-2026-61681

Go · hatchet-dev/hatchet

Summary

Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler

Advisory details

Summary

The SNS UnsubscribeConfirmation handler in internal/integrations/ingestors/sns/sns.go makes an unvalidated http.Get() call to payload.UnsubscribeURL without any URL restriction. Because UnsubscribeURL is intentionally excluded from the BuildSignature() signed field list, an attacker can replace this field in a legitimately AWS-signed message with an arbitrary internal URL, bypassing the VerifyPayload() signature check entirely and triggering a Server-Side Request Forgery (SSRF) against internal infrastructure — including the EC2 Instance Metadata Service (IMDS) at 169.254.169.254.

Impact

This is a Server-Side Request Forgery (SSRF) vulnerability. An attacker with a Hatchet account and an AWS Free Tier account can:

  • Reach the EC2 IMDS endpoint and retrieve IAM temporary credentials if Hatchet is deployed on AWS
  • Port-scan and probe internal services not exposed to the internet
  • Access internal HTTP APIs (e.g., Kubernetes API server, internal dashboards) from the Hatchet server's network context

References

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